/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.mrunit.internal.util;

import java.util.List;

public final class ArgumentChecker {

  private ArgumentChecker() {
    // dont create this class
  }

  /**
   * @param object
   * @return object if not null
   */
  public static <T> T returnNonNull(final T object) {
    if (object == null) {
      throw new NullPointerException();
    }
    return object;
  }

  /**
   * @param list
   * @return list if all entries not null
   */
  public static <T> List<T> returnNonNull(final List<T> list) {
    for (int i = 0; i < list.size(); i++) {
      if (list.get(i) == null) {
        throw new NullPointerException("entry " + i + " in list is null");
      }
    }
    return list;
  }

}
